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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29d465e84d5475d0a4203ab24f7a72448494eafed260f1b8feed7b0e6c973545' 
  AND token = 'v16tv3ONRE+I9SHFrYFtJDJEb8ApAnuQwcTKRbfZK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}